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    <title>Document</title>
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  <body>
    <script>
      // every() 数据判断必须全部满足返回true否则返回false
      (function () {
        let arr = [1, 2, 3];
        const is = arr.every(function (item) {
          return item == 1;
        });
        console.log(is); //false
      })();
    </script>
  </body>
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